Bart Ehrman destroys Christianity in under 12 minutes.

[robvalue]

No, they weren't written independently. Mark was the original account (which amusingly did not contain the resurrection; this was later forged onto the end of it). Matthew came later and heavily cribbed off of Mark, then Luke came and did the same. None are believed to be eye witnesses. When read in this order (not the order they appear in the bible) it becomes apparent that the story was becoming more and more embellished over time.

John, written much later, was just a new piece of propaganda loosely based on the other 3.